Writers who can also read data and want a results-tied service with predictable monthly retainers
Tying fees to attributed revenue, then losing a client when a flat month or a deliverability problem makes the numbers look bad
Ranges reflect realistic outcomes across reported data — not best-case promises. See the full earnings breakdown below.
What this business actually is
An email marketing agency manages the email and SMS channel for ecommerce brands and creators — usually inside Klaviyo, with some clients on Mailchimp, Omnisend, or Postscript for SMS. You build the automated flows that run on autopilot (welcome series, abandoned cart, browse abandonment, post-purchase, win-back) and you plan and send the weekly campaign calendar (promotions, product launches, content, holiday sends). For most ecommerce stores, email and SMS drive 20 to 40 percent of total revenue, so the channel is high-leverage and brands are willing to pay for someone who can own it.
What you actually do — the daily reality
A typical week is split between writing and building. You draft subject lines, email copy, and segments; design or brief templates; and schedule the week's campaigns for each client. Around that you are in Klaviyo dashboards checking open rates, click rates, placed-order revenue, and deliverability — watching for spam-folder problems, list decay, and Apple Mail Privacy noise that makes opens unreliable. Mondays and Tuesdays tend to be planning and building; the rest of the week is sends, monitoring, and client check-ins. You will also spend real time each month pulling the revenue-attributed numbers into a report, because clients judge you on the dollar figure Klaviyo attributes to email, not on how clever the copy was.
Real startup costs — itemized
Every realistic cost, with low and high ranges. You can start near $300 by skipping what is optional, but a comfortable starting budget is closer to $3,000.
| Item | Low | High | Notes |
|---|---|---|---|
| Klaviyo partner account (free; you bill clients on their own accounts) | Free | $0 | |
| Portfolio site / one-page case study site | Free | $300 | Can skip at first |
| Design tool (Figma free or Canva Pro) for email templates | Free | $150 | Annual |
| Project management + client comms (Notion, ClickUp, Slack) | Free | $240 | Annual |
| Grammarly / editing and proofing tools | Free | $144 | Annual Can skip at first |
| Business registration / LLC | $50 | $300 | |
| Klaviyo certification + a paid email-marketing course | Free | $800 | Can skip at first |
| Cold-email / outreach tooling for prospecting | Free | $600 | Annual Can skip at first |
| Realistic total to start | $300 | $3,000 | Minimum vs. comfortable budget |
Real earnings — an honest breakdown
Not best-case fantasies. Here is what beginners, experienced operators, and the top earners actually report — and what it took to get there.
Most people start by managing one or two brands at $750 to $2,000 per month each, often landing around $1,500 to $4,000 per month total in the first year while they build proof. A common starting structure is a flat retainer plus a small performance share (frequently 5 to 10 percent of email-and-SMS-attributed revenue).
With a roster of four to eight ecommerce clients on retainers of $2,000 to $5,000 each, experienced solo operators and two-person agencies commonly report $8,000 to $18,000 per month. Performance share on larger stores can push individual accounts well above the base retainer during launches and holiday peaks.
Specialized agencies with a team of strategists, copywriters, and designers and 15 to 40 retained brands gross $40,000 to $150,000+ per month. Getting there means productizing the service, hiring and training a team, and surviving the client churn that comes with performance-based fees — most operators never build past a handful of clients and stay comfortably solo.
Effective rates commonly run $60 to $200 per hour of focused work once you are efficient with templates and flows. Counting prospecting, reporting, and revisions, blended rates for solo operators are often $50 to $120 per hour.
Client store size and your pricing model matter most. A 10 percent revenue share on a $300k/month store dwarfs a flat $1,500 retainer on a small shop. After that, retention is everything — replacing a churned client costs far more time than keeping a happy one, so results and communication drive your real income.
How to actually start — step by step
- Month 1
Get Klaviyo-certified (it is free) and build two or three sample flows and a campaign on a demo or your own store so you have real screenshots. Pick a niche you understand — supplements, apparel, beauty, coffee — because flow logic and offers differ by category.
- Month 1-2
Land one or two clients at a deliberately fair rate in exchange for permission to use results as a case study. Offer a flat retainer plus a small performance share so the client feels the risk is shared. Get full access to their Klaviyo and historical revenue before quoting.
- Month 2-3
Build the core automated flows first (welcome, abandoned cart, post-purchase, browse abandonment) — these usually produce the fastest revenue lift and earn trust. Then establish a weekly campaign calendar and a clean monthly report tied to attributed revenue.
- Days 60-120
Document your first real result as a case study with before/after attributed-revenue numbers. Use it to raise your rates and to do targeted outreach to similar-sized stores in the same niche.
- Ongoing
Protect deliverability obsessively — authenticate domains (SPF, DKIM, DMARC), manage sunset/suppression of unengaged subscribers, and warm up sending — because one client's list problems can quietly tank results across the board.
What skills you actually need
Skills you must have before starting
- Persuasive writing — subject lines, hooks, and offers that get opened and clicked
- Comfort reading data: open/click rates, placed-order revenue, and attribution windows
- Enough sales ability to land retainers and set expectations about what email can and cannot do
Skills you can learn as you go
- Klaviyo flow building, segmentation, and the platform mechanics (free certification plus practice)
- Email design and mobile-friendly templates (Figma/Canva plus Klaviyo's editor)
- Deliverability fundamentals — authentication, list hygiene, and warmup
What separates average operators from high earners
- Strategy: knowing which flows and segments to prioritize for a given store rather than building everything
- Owning deliverability so emails actually reach the inbox, which most generalists ignore until it breaks
- Translating results into a clear revenue story clients understand, which is what keeps retainers alive
What most people get wrong
The common mistakes, the reasons people quit, and the things nobody warns you about.
- Promising a specific revenue lift up front, then losing the client when a slow month or external factor makes the numbers dip
- Ignoring deliverability until emails start hitting spam, at which point attributed revenue collapses and the client blames you
- Taking any client regardless of store size, so a flat retainer on a tiny store costs more time than it earns
- Over-relying on open rates after Apple Mail Privacy Protection made them unreliable, instead of judging clicks and revenue
- Blasting the whole list every send and burning engagement, which hurts inbox placement for everyone on the list
- Building beautiful campaigns but never setting up the automated flows that quietly drive the majority of email revenue
Tools and equipment you need
What to buy cheap, where to invest, and what you can rent or borrow at first.
- Klaviyo (client-funded) Free – $0
The default platform for ecommerce email/SMS. You work as a partner inside each client's account, so they pay the platform fee.
- SMS add-on (Postscript or Klaviyo SMS) Free – $0
Many ecommerce clients want SMS bundled. Funded by the client.
- Design tool (Figma or Canva Pro) Free – $150
For building reusable, on-brand email templates fast.
- Deliverability / inbox testing (Litmus or Email on Acid) Free – $1,200
Tests rendering and spam scoring. Optional early, valuable as you scale.
- Reporting + project management (Notion, ClickUp) Free – $240
Keeps multiple clients' calendars and monthly reports organized.
- A reliable laptop you already own
No special hardware needed — this is a desk-and-screen business.
How to find customers
What actually works:
- Targeted cold outreach to ecommerce brands of the right size — sign up for their list, point out a missing flow or weak welcome series, and offer a free audit
- Niching down (e.g. supplement brands or apparel) so referrals and word of mouth compound within one category
- Klaviyo's partner/agency directory and marketplace once you have certification and a case study
- Partnerships with Shopify developers, paid-ads agencies, and DTC consultants who have clients but do not handle email
- Sharing teardowns and results on LinkedIn and X where ecommerce founders actually pay attention
Where your customers are: Shopify and other ecommerce store owners doing roughly $50k to $1M+ per month — big enough that email moves real money but often too small to have an in-house email team. Creators with large audiences who monetize through products are a secondary market.
How long it takes to build a client base: Landing the first one or two clients usually takes one to three months of consistent outreach and a credible audit. A stable roster of four-plus retainers typically takes six to twelve months, because each case study makes the next pitch easier.
What is usually a waste of time: Broad, generic cold blasts with no audit and a polished agency website before you have a single attributed-revenue result. Founders respond to a specific, relevant observation about their own store, not branding.
How this business scales
Can you grow it to full-time? Yes. Four to six well-sized retainers will replace most jobs, and email's revenue tie makes clients sticky once you are producing results. The solo ceiling is the number of clients one person can write and build for, usually six to eight before quality slips.
Can you hire people and step back? Realistic. The work productizes well — a copywriter, a designer, and a strategist can run accounts to a checklist while you handle strategy and client relationships. Stepping back fully requires documented processes and someone who owns deliverability and reporting.
Can you sell it one day? Email agencies with documented retainers, low churn, and clear SOPs do sell, typically for a multiple of recurring profit. Buyers care about retention and whether the results survive without the founder writing every email.
What scaling actually requires: Standardized onboarding, templated flows and reporting, a hiring and quality-control system, and a steady lead source so you are not personally prospecting. The hard part is keeping results consistent as more accounts run through junior team members.
Is this right for you? An honest checklist
A strong fit if…
- You can write copy that persuades and you also enjoy reading the numbers behind it
- You like recurring retainer income over one-off projects
- You are comfortable owning a results-tied channel and reporting on dollars, not vanity metrics
- You can niche into a category and learn its offers and buying patterns
A poor fit if…
- You dislike accountability for measurable outcomes and revenue numbers
- You will not learn the technical side of deliverability and list hygiene
- You want a purely creative role with no data or client management
- You need income within two weeks — this takes a month or more to ramp
Before you start, ask yourself…
- Am I comfortable being judged on a revenue number every month, including the months it dips?
- Will I actually maintain deliverability and list hygiene, the unglamorous work that determines results?
- Can I land clients large enough that my retainer plus performance share is worth my time?
Frequently asked questions
Do I need to be an expert in Klaviyo before I start?
You need solid working knowledge, not mastery. Klaviyo offers free certification and a generous free tier for practice, so you can build sample flows on a demo store before your first client. Expect to keep learning on real accounts — segmentation and deliverability are where depth actually comes from.
Should I charge a flat retainer or a percentage of revenue?
Most agencies use a hybrid: a flat monthly retainer that covers your base work plus a small share (often 5 to 10 percent) of email-and-SMS-attributed revenue. The flat fee protects you in slow months; the share rewards you when launches and holidays perform. Pure performance-only deals are risky early because attribution and external factors are partly out of your control.
How much revenue can email realistically drive for a client?
For a typical ecommerce store, email and SMS together often account for 20 to 40 percent of total revenue once flows and a consistent campaign calendar are in place. Be honest that this depends heavily on list size, product margin, and how often the brand can give people a reason to buy — you are optimizing an existing audience, not creating demand from nothing.
What happens to my income if a client has a bad month?
This is the core risk of revenue-share pricing. A flat month, a supply issue, or a deliverability problem can shrink both attributed revenue and client confidence at the same time. A flat-retainer floor cushions your income, and clear monthly reporting that separates email performance from broader business issues protects the relationship.
Why is deliverability such a big deal?
If emails land in spam, even perfect copy earns nothing, and attributed revenue collapses. You manage this by authenticating sending domains (SPF, DKIM, DMARC), suppressing unengaged subscribers, warming up new sending, and not blasting the entire list every time. It is the least glamorous part of the job and the one that quietly determines whether you keep clients.
Is this still viable now that open rates are unreliable?
Yes, but you have to measure the right things. Apple's Mail Privacy Protection inflates open rates, so experienced operators judge performance by clicks, conversions, and placed-order revenue instead. The channel itself remains one of the highest-ROI marketing channels in ecommerce.
How many clients can I handle solo?
Most solo operators max out around six to eight retained brands before campaign quality and responsiveness slip, depending on how much SMS and custom design each requires. Beyond that you generally need to templatize heavily and bring on a copywriter or designer.
Data sources and research notes
Figures on this page reflect ranges reported across the sources below plus operator accounts. They are honest estimates, not guarantees — your results will vary.
- Klaviyo — Marketing benchmarks and partner program documentation (flow performance and attribution norms)
- Litmus — State of Email reports (deliverability and engagement trends)
- U.S. Bureau of Labor Statistics — Advertising, Promotions, and Marketing Managers occupational data
- Agency operator communities and DTC marketing forums for real-world retainer and revenue-share pricing
Last reviewed: June 2026